INSTALLATION INSTRUCTIONS WALL MOUNTED PACKAGE HEAT PUMPS WH421 WH483 WH602

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1 INSTALLATION INSTRUCTIONS WALL MOUNTED PACKAGE HEAT PUMPS MODELS: WH42 WH43 WH2 BARD MANUFACTURING COMPANY Bryan, Ohio 4350 Since 94...Moving ahead, just as planned. Manual: Supersedes: File: Volume III Tab 7 Date: Copyright 2002

2 CONTENTS Getting Other Information and Publications... For more information, contact these publishers:... Wall Mount General Information... 2 Air Conditioner Wall Mount Model Nomenclature... 2 Shipping Damage... 5 General... 5 Duct Work... 5 Filters... 5 Fresh Air Intake... Condensate Drain... Installation Instructions... 7 Wall Mounting Information... 7 Mounting the Unit... 7 Typical Installations... 7 Wiring Main Power... Wiring Low Voltage Wiring... Thermostat Wiring... 2 Heat Anticipation... 2 Thermostat Indicator Lamps... 3 Emergency Heat Position... 3 Compressor Malfunction... 3 Start Up... 4 Important Installer Note... 4 High Pressure Switch... 4 Three Phase Scroll Compressor Start Up Information... 4 Phase Monitor... 5 Service Hints... 5 Sequence of Operation... 5 Pressure Service Ports... 5 Defrost Cycle... 5 Troubleshooting... 7 Solid State Heat Pump Control Troubleshooting Procedure... 7 Checking Temperature Sensor Outdoor Unit Circuit... Fan Blade Setting Dimensions... 9 Removal of Fan Shroud... 9 Refrigerant Charge... 9 Pressure Chart Optional Accessories... 2 Figures Figure Unit Dimensions... 3 Figure 2 Blower Damper Assembly... Figure 3 Mounting Instructions... Figure 3A Electric Heat Clearance... Figure 4 Wall-Mounting Instructions... 9 Figure 5 Wall-Mounting Instructions... 9 Figure Common Wall-Mounting Instructions... Figure 7 Unit 24V Terminal Board... Figure Compressor Cutoff and Outdoor Thermostat Wiring... 2 Figure 9 Start-Up Label... 4 Figure Defrost Control Board... Figure Fan Blade Setting... 9 Tables Table Electrical Specifications... 2 Table 2 Electric Heat Table... 4 Table 3 Thermostat Wire Size... 2 Table 4 Wall Thermostat and Subbase Combinations... 3 Table 5 Troubleshooting... 7 Table Fan Blade Dimensions... 9 Table 7 Suction Line Temperatures... 9 Table Recommended Operating Ranges... 9 Table 9 Indoor Blower Performance... 9 Table Maximum ESP of Operation Table Cooling Pressures Table 2 Heating Pressures... 2 Table 3 Optional Accessories... 2 i

3 Getting Other Information and Publications These publications can help you install the air conditioner or heat pump. You can usually find these at your local library or purchase them directly from the publisher. Be sure to consult current edition of each standard. National Electrical Code... ANSI/NFPA 70 FOR MORE INFORMATION, CONTACT THESE PUBLISHERS: ACCA Air Conditioning Contractors of America 72 New Hampshire Ave. N.W. Washington, DC Telephone: (202) Fax: (202) Standard for the Installation... ANSI/NFPA 90A of Air Conditioning and Ventilating Systems Standard for Warm Air... ANSI/NFPA 90B Heating and Air Conditioning Systems ANSI American National Standards Institute West Street, 3th Floor New York, NY 03 Telephone: (22) Fax: (22) Load Calculation for... ACCA Manual J or Residential Winter and Manual N Summer Air Conditioning Low Pressure, Low Velocity... ACCA Manual D or Duct System Design for Winter Manual Q and Summer Air Conditioning ASHRAE American Society of Heating Refrigerating and Air Conditioning Engineers, Inc. 79 Tullie Circle, N.E. Atlanta, GA Telephone: (404) Fax: (404) NFPA National Fire Protection Association Batterymarch Park P.O. Box 9 Quincy, MA Telephone: (00) Fax: (7) Manufactured under the following U.S. patent numbers: 5,30,744; 5,002,; 4,924,934; 4,75,520; 4,25,93; 4,432,409 Other patents pending. Manual Page

4 WALL MOUNT GENERAL INFORMATION HEAT PUMP WALL MOUNT MODEL NOMENCLATURE MODEL NUMBER CAPACITY 42 3-/2 Ton 4 4 Ton 5 Ton VOLTS & PHASE A 230/20/- B 230/20/-3 C 4/-3 REVISION WH 4 A B KW 00 No KW 05 5 KW 0 KW 09 9 KW KW 5 5 KW KW KW VENTILATION OPTIONS Barometric Fresh Air Damper (Standard) B Blank-off Plate M Motorized Fresh Air Damper V Commercial Room Ventilator - Motorized with Exhaust E Economizer (Internal) - Fully Modulating with Exhaust R Energy Recovery Ventilator - Motorized with Exhaust COLOR OPTIONS Beige (Standard) White 2 Mesa Tan 3 Colonial White 4 Buckeye Gray FILTER OPTIONS One Inch Throwaway (Standard) W One Inch Washable P Two Inch Pleated CONTROL MODULES (See Chart Below) COIL OPTIONS Standard Phenolic Coated Evaporator 2 Phenolic Coated Condenser 3 Phenolic Coated Evaporator and Condenser OUTLET OPTIONS Front (Standard) NOTE: For 0KW and circuit breakers (230/20 V) or pull disconnects (4 V) applications, insert 0Z in the KW field of model number. TABLE ELECTRIC HEAT TABLE Models WH42-A WH42-B WH43-B WH42-C WH43-A WH2-A WH43-B WH2-B WH43-C WH2-C KW A BTU A BTU A BTU A BTU A BTU A BTU A BTU A BTU A BTU A BTU Manual Page 2

5 FIGURE UNIT DIMENSIONS MIS-4 Manual Page 3

6 TABLE 2 ELECTRICAL SPECIFICATIONS SINGLE CIRCUIT DUAL CIRCUIT Model Rated Volts & Phase No. Field Power Ckts. 4 Minimum Circuit Ampacity Maximum External Fuse or Circuit Breaker 2 Field Power Wire Size 2 Ground Wire Size 4 Minimum Circuit Ampacity Ckt A Ckt B Maximum External Fuse or Ckt.Breaker Ckt A Ckt B 2 Field Power Wire Size Ckt A Ckt B 2 Ground Wire Size Ckt A Ckt B WH42-A00, A0Z A05 3 A A5 230/20- or 2 or 2 or WH42-B00, B0Z B0 3 B09 B5 230/ WH42-C00, C0Z C0 3 C09 C WH43-A00, A0Z A04 A05 3 A A5 A20 230/20- or 2 or or 2 or WH43-B00, B0Z B0 3 B09 B5 B 230/ WH43-C00, C0Z 3 C09 C WH2-A00, A0Z A05 3 A A5 A20 230/20- or 2 or or 2 or WH2-B00, B0Z 3 B09 B5 B 230/ WH2-C00, C0Z 3 C09 C Maximum size of the time delay fuse or HACR type circuit breaker for protection of field wiring conductors. Based on 75 C copper wire. All wiring must conform to NEC and all local codes. ƒ Maximum KW that can operate with heat pump on. These Minimum Circuit Ampacity" values are to be used for sizing the field power conductors. Refer to the National Electrical Code (latest version), article 3 for power conductor sizing. CAUTION: When more than one field power conductor circuit is run through one conduit, the conductors must be derated. Pay special attention to note of table 3 regarding Ampacity Adjustment Factors when more than 3 conductors are in a raceway. Manual Page 4

7 SHIPPING DAMAGE Upon receipt of equipment, the carton should be checked for external signs of shipping damage. If damage is found, the receiving party must contact the last carrier immediately, preferably in writing, requesting inspection by the carrier s agent. GENERAL The equipment covered in this manual is to be installed by trained, experienced service and installation technicians. The refrigerant system is completely assembled and charged. All internal wiring is complete. The unit is designed for use with or without duct work. Flanges are provided for attaching the supply and return ducts. These instructions and any instructions packaged with any separate equipment required to make up the entire heat pump system should be carefully read before beginning the installation. Note particularly Starting Procedure and any tags and/or labels attached to the equipment. While these instructions are intended as a general recommended guide, they do not supersede any national and/or local codes in any way. Authorities having jurisdiction should be consulted before the installation is made. See Page for information on codes and standards. Size of unit for a proposed installation should be based on heat loss calculation made according to methods of Air Conditioning Contractors of America (ACCA). The air duct should be installed in accordance with the Standards of the National Fire Protection Association for the Installation of Air Conditioning and Ventilating Systems of Other Than Residence Type, NFPA No. 90A, and Residence Type Warm Air Heating and Air Conditioning Systems, NFPA No. 90B. Where local regulations are at a variance with instructions, installer should adhere to local codes. DUCT WORK Any heat pump is more critical of proper operating charge and an adequate duct system than a straight air conditioning unit. All duct work, supply and return, must be properly sized for the design air flow requirement of the equipment. Air Conditioning Contractors of America (ACCA) is an excellent guide to proper sizing. All duct work or portions thereof not in the conditioned space should be properly insulated in order to both conserve energy and prevent condensation or moisture damage. Refer to Table for maximum static pressure available for duct design. Design the duct work according to methods given by the Air Conditioning Contractors of America (ACCA). When duct runs through unheated spaces, it should be insulated with a minimum of one inch of insulation. Use insulation with a vapor barrier on the outside of the insulation. Flexible joints should be used to connect the duct work to the equipment in order to keep the noise transmission to a minimum. A /4 inch clearance to combustible material for the first three feet (3') of duct attached to the outlet air frame is required. See Wall Mounting Instructions and Figures 4 and 4 for further details. Ducts through the walls must be insulated and all joints taped or sealed to prevent air or moisture entering the wall cavity. CAUTION Some installations may not require any return air duct. A metallic return air grille is required with installations not requiring a return air duct. The spacing between louvers on the grille shall not be larger than 5/ inches. Any grille that meets the 5/ inch louver criteria, may be used. It is recommended that Bard Return Air Grille Kit RG-2 thru RG-5 or RFG-2 thru RFG-5 be installed when no return duct is used. Contact distributor or factory for ordering information. If using a return air filter grille, filters must be of sufficient size to allow a maximum velocity of 400 fpm. NOTE:If no return air duct is used, applicable installation codes may limit this cabinet to installation only in a single story structure. FILTERS A inch throwaway filter is supplied with each unit. The filter slides into position making it easy to service. This filter can be serviced from the outside by removing the service door. A inch washable filter and 2 inch pleated filter are also available as optional accessories. The internal filter brackets are adjustable to accommodate the 2 inch filter by bending down the tabs to allow spacing for the 2 inch filters. Manual Page 5

8 FRESH AIR INTAKE All units are built with fresh air inlet slots punched in the service panel. If the unit is equipped with the fresh air damper assembly, the assembly is shipped already attached to the unit. The damper blade is locked in the closed position. To allow the damper to operate, the maximum and minium blade position stops must be installed. See Figure 2. All capacity, efficiency and cost of operation information as required for Department of Energy Energyguide Fact Sheets is based upon the fresh air blank-off plate in place and is recommended for maximum energy efficiency. The blank-off plate is available upon request from the factory and is installed in place of the fresh air damper shipped with each unit. CONDENSATE DRAIN A plastic drain hose extends from the drain pan at the top of the unit down to the unit base. There are openings in the unit base for the drain hose to pass through. In the event the drain hose is connected to a drain system of some type, it must be an open or vented type system to assure proper drainage. FIGURE 2 BLOWER DAMPER ASSEMBLY BLADE IS LOCKED CLOSED FOR SHIPPING MIS-93 Manual Page

9 INSTALLATION INSTRUCTIONS WALL MOUNTING INFORMATION. Two holes, for the supply and return air openings, must be cut through the wall as shown in Figure On wood-frame walls, the wall construction must be strong and rigid enough to carry the weight of the unit without transmitting any unit vibration. See Figures 4 and 5. WARNING Fire hazard can result if /4 inch clearance to combustible materials for supply air duct is not maintained. See Figure Concrete block walls must be thoroughly inspected to insure that they are capable of carrying the weight of the installing unit. See Figure 4. MOUNTING THE UNIT. These units are secured by wall mounting brackets which secure the unit to the outside wall surface at both sides. A bottom mounting bracket is provided for ease of installation, but it is not required. 2. The unit itself is suitable for 0 inch clearance, but the supply air duct flange and the first 3 feet of supply air duct require a minimum of /4 inch clearance to combustible material. If a combustible wall, use a minimum of 30-/2" x -/2" dimensions for sizing. However, it is generally recommended that a inch clearance is used for ease of installation and maintaining the required clearance to combustible material. The supply air opening would then be 32" x 2". See Figures 3, 4 and 7 for details. WARNING Failure to provide the /4 inch clearance between the supply duct and a combustible surface for the first 3 feet of duct can result in fire. 3. Locate and mark lag bolt locations and bottom mounting bracket location. See Figure Mount bottom mounting bracket. 5. Hook top rain flashing under back bend of top. Top rain flashing is shipped secured to the right side of the back.. Position unit in opening and secure with 5/ lag bolts; use 7/ inch diameter flat washers on the lag bolts. 7. Secure rain flashing to wall and caulk across entire length of top. See Figure 3.. For additional mounting rigidity, the return air and supply air frames or collars can be drilled and screwed or welded to the structural wall itself (depending upon wall construction). Be sure to observe required clearance if combustible wall. 9. On side by side installations, maintain a minimum of 20 inches clearance on right side to allow access to heat strips and control panel, and to allow proper airflow to the outdoor coil. Additional clearance may be required to meet local or national codes. TYPICAL INSTALLATIONS See Figure for common ways to install the wall-mount unit. Manual Page 7

10 FIGURE 3 MOUNTING INSTRUCTIONS NOTE: It is recommended that a bead of silicone caulking be placed behind the side mounting flanges and under the top flashing at the time of installation. MIS-79 FIGURE 3A ELECTRIC HEAT CLEARANCE WARNING A minimum of /4 inch clearance must be maintained between the supply air duct and combustible materials. This is required for the first 3 feet of ducting. It is important to insure that the /4 inch minimum spacing is maintained at all points. Side section view of supply air duct for wall mounted unit showing /4 inch clearance to combustible surfaces. Failure to do this could result in overheating the combustible material and may result in fire. MIS-277 Manual Page

11 FIGURE 4 WALL-MOUNTING INSTRUCTIONS SEE FIGURE 3 MOUNTING INSTRUCTIONS MIS-54 FIGURE 5 WALL-MOUNTING INSTRUCTIONS SEE UNIT DIMENSIONS, FIGURE, FOR ACTUAL DIMENSIONS SEE FIGURE FOR DUCT DIMENSIONS MIS-549 Manual Page 9

12 FIGURE COMMON WALL-MOUNTING INSTALLATIONS MIS-550 Manual Page

13 WIRING MAIN POWER Refer to the unit rating plate for wire sizing information and maximum fuse or HACR" type circuit breaker size. Each outdoor unit is marked with a Minimum Circuit Ampacity. This means that the field wiring used must be sized to carry that amount of current. Depending on the installed KW of electric heat, there may be two field power circuits required. If this is the case, the unit serial plate will so indicate. All models are suitable only for connection with copper wire. Each unit and/or wiring diagram will be marked Use Copper Conductors Only. These instructions must be adhered to. Refer to the National Electrical Code (NEC) for complete current carrying capacity data on the various insulation grades of wiring material. All wiring must conform to NEC and all local codes. The electrical data lists fuse and wire sizes (75ºC copper) for all models, including the most commonly used heater sizes. Also shown are the number of field power circuits required for the various models with heaters. NOTE:The voltage should be measured at the field power connection point in the unit and while the unit is operating at full load (maximum amperage operating condition). Nine (9) wires should be run from thermostat subbase to the 24V terminal board in the unit. A nine conductor, gauge copper, color-coded thermostat cable is recommended. The connection points are shown in Figure 7. FIGURE 7 UNIT 24V TERMINAL BOARD See Note The unit rating plate lists a Maximum Time Delay Relay Fuse or HACR" type circuit breaker that is to be used with the equipment. The correct size must be used for proper circuit protection and also to assure that there will be no nuisance tripping due to the momentary high starting current of the compressor motor. The disconnect access door on this unit may be locked to prevent unauthorized access to the disconnect. To convert for the locking capability, bend the tab located in the bottom left hand corner of the disconnect opening under the disconnect access panel straight out. This tab will now line up with the slot in the door. When shut, a padlock may be placed through the hole in the tab preventing entry. See Start-up section for information on three phase scroll compressor start-ups. WIRING LOW VOLTAGE WIRING 230/20V, phase and 3 phase equipment dual primary voltage transformers. All equipment leaves the factory wired on 240V tap. For 20V operation, reconnect from 240V to 20V tap. The acceptable operating voltage range for the 240 and 20V taps are: Tap Range MIS-440 FACTORY JUMPER IMPORTANT NOTE: Only the thermostat and subbase combinations as shown at the right will work with this equipment. The thermostat and subbase must be matched and the correct operation can be assured only by proper selection and application of these parts. Note : F93-30 thermostat must be set to "Heat Pump" mode to operate properly. Press the program"run" button to make sure the thermostat is in run program model. Press time "FWD" and "BACK" at the same time to enter User Configuration Menu. Press and hold set "TIME" and "DAY" for about 3 seconds to enter Installer Menu. The thermostat will display "MULTI STG" Press the "UP" or "DOWN" button until the display reads "HEAT PUMP" Press program "RUN" button to resume operation. Manual Page

14 Transformer VA TABLE 3 THERMOSTAT WIRE SIZE FLA Wire Gauge 20 gauge gauge gauge 4 gauge 2 gauge THERMOSTAT WIRING Maximum Distance In Feet COMPRESSOR CUTOFF THERMOSTAT AND OUTDOOR THERMOSTATS Heat pump compressor operation at outdoor temperatures below 0 F are neither desirable nor advantageous in terms of efficiency. Since most equipment at time of manufacture is not designated for any specific destination of the country and most of the equipment is installed in areas not approaching the lower outdoor temperature range, the compressor cutoffs are not factory installed. Outdoor thermostats are available to hold off various banks of electric heat until needed as determined by outdoor temperature. The set point of either type of thermostat is variable with geographic region and sizing of the heating equipment to the structure Utilization of the Heating Application Data and the heat loss calculation of the building are useful in determining the correct set points. HEAT ANTICIPATION Both of the thermostats in Groups A and B below have a fixed heat anticipator for stage with no adjustment required. Stage 2 has an adjustable anticipator for the W2 connection and fixed for the W3 connection. Both the W2 and W3 circuits are controlled by the stage 2 bulb. The only heat anticipator that needs to be checked is stage 2 and it should be set to match the load carried by the W2 circuit. The normal factory wiring provides for only on electric heat contactor to be controlled by W2, and the anticipator should be set at.40a. If special field wiring is done, it is best to actually measure the load but a good role is.40a for each heat contactor controlled by W2. FIGURE COMPRESSOR CUTOFF AND OUTDOOR THERMOSTAT WIRING 4 - KW PH --- & 9KW 3-PH 5-20KW -PH & 3-PH MIS-409 Manual Page 2

15 TABLE 4 WALL THERMOSTAT AND SUBBASE COMBINATIONS Thermostat (T4A7) (T74R29) (T74N24) (T5G70) (F93-30) Subbase (Q74L) (Q74F2) Predominant Features stg. cool; 2 stg. heat; Mercury bulb Manual changeover 2 stg. cool; 2 stg. heat; Mercury bulb Manual changeover 2 stg. cool; 2 stg. heat; Mercury bulb Auto or Manual changeover stg. cool; 2 stg. heat Electronic Non-Programmable Auto or Manual changeover 2 stg. cool; 2 stg. heat Programmable Electronic Auto or Manual changeover () No automatic changeover position -- must be manually placed in heat or cool. Reversing valve remains energized at all times system switch is in heat position (except during defrost cycle). No pressure equalization noise when thermostat is satisfied on either heating or cooling. (2) Allows thermostat to control both heating and cooling operation when set in "Auto" position. Reversing valve de-energizes at end of each "On" heating cycle. IMPORTANT NOTE: Both thermostat and subbase combinations shown above in Groups A and B incorporate the following features: Man-Auto fan switch, Off-Heat-Cool-Em. Heat switch, and two (2) indicator lamps one for emergency heat and one for compressor malfunction. THERMOSTAT INDICATOR LAMPS The red lamp marked "Em. Ht." comes on and stays on whenever the system switch is placed in the emergency heat position. The green lamp marked "Check" will come on if there is any problem that prevents the compressor from running when it is supposed to be. EMERGENCY HEAT POSITION The operator of the equipment must manually place the system switch in this position. This is done when there is a know problem with the unit, or when the green "Check" lamp comes on indicating a problem. COMPRESSOR MALFUNCTION LIGHT Actuation of the green "Check" lamp is accomplished by a relay output from the heat pump control board which is factory installed. Any condition such as loss of charge, high head pressure, etc., that will prevent compressor for operating will cause green lamp to activate. This is a signal to the operator of the equipment to place system in emergency heat position. Manual Page 3

16 START UP IMPORTANT INSTALLER NOTE For improved start-up performance, wash the indoor coil with a dishwashing detergent. CRANKCASE HEATERS WA42 units are provided with compressor crankcase heat. WH2 and WH43 units are not provided with crankcase heat. These units utilize scroll compressors which do not require crankcase heat in this application. The WH42 models have an insertion well-type heater located in the lower section of the compressor housing this is a self-regulating type heater that draws only enough power to maintain the compressor at a safe temperature on these units. Some form of crankcase heat is essential to prevent liquid refrigerant from migrating to the compressor, causing oil pump out on compressor start-up and possible valve failure due to compressing a liquid. The decal in Figure 9 is affixed to all WA42 units detailing start-up procedure. This is very important. Please read carefully. HIGH PRESSURE SWITCH The WH43 and WH2 models are supplied with a remote reset high pressure switch. If tripped, this pressure switch may be reset by turning the thermostat off then back on again. THREE PHASE SCROLL COMPRESSOR START UP INFORMATION Scroll compressors, like several other types of compressors, will only compress in one rotational direction. Direction of rotation is not an issue with single phase compressors since they will always start and run in the proper direction. However, three phase compressors will rotate in either direction depending upon phasing of the power. Since there is a chance of connecting power in such a way as to cause rotation in the reverse direction, verification of proper rotation must be made. All three phase units incorporate a phase monitor to ensure proper field wiring. See the Phase Monitor" on page 5 of this manual. Verification of proper rotation must be made any time a compressor is change or rewired. If improper rotation is corrected at this time there will be no negative impact on the durability of the compressor. However, reverse operation for over one hour may have a negative impact on the bearing due to oil pump out. Manual Page 4 FIGURE 9 START UP LABEL IMPORTANT THESE PROCEDURES MUST BE FOLLOWED AT INITIAL START UP AND AT ANY TIME POWER HAS BEEN REMOVED FOR 2 HOURS OR LONGER. TO PREVENT COMPRESSOR DAMAGE WHICH MAY RESULT FROM THE PRES- ENCE OF LIQUID REFRIGERANT IN THE COMPRESSOR CRANKCASE:. MAKE CERTAIN THE ROOM THERMO- STAT IS IN THE OFF POSITION. (THE COMPRESSOR IS NOT TO OPERATE.) 2. APPLY POWER BY CLOSING THE SYSTEM DISCONNECT SWITCH. THIS ENERGIZES THE COMPRES- SOR HEATER WHICH EVAPORATES THE LIQUID REFRIGERANT IN THE CRANKCASE. 3. ALLOW 4 HOURS OR MINUTES PER POUND OF REFRIGERANT IN THE SYSTEM AS NOTED ON THE UNIT RATING PLATE, WHICHEVER IS GREATER. 4. AFTER PROPER ELAPSED TIME THE THERMOSTAT MAY BE SET TO OPER- ATE THE COMPRESSOR. 5. ECEPT AS REQUIRED FOR SAFETY WHILE SERVICING, DO NOT OPEN SYSTEM DISCONNECT SWITCH NOTE:If compressor is allowed to run in reverse rotation for several minutes, the compressor's internal protector will trip. All three phase ZR3 compressors are wired identical internally. As a result, once the correct phasing is determined for a specific system or installation, connecting properly phased power leads to the same Fusite terminal should maintain proper rotation direction. Verification of proper rotation direction is made by observing that suction pressure drops and discharge pressure rises when the compressor is energized. Reverse rotation also results in an elevated sound level over that with correct rotations, as well as, substantially reduced current draw compared to tabulated values. The direction of rotation of the compressor may be changed by reversing any two line connections to the unit.

17 PHASE MONITOR All units with three phase compressors are equipped with a 3 phase line monitor to prevent compressor damage due to phase reversal. The phase monitor in this unit is equipped with two LEDs. If the Y signal is present at the phase monitor and phases are correct, the green LED will light. If phases are reversed, the red fault LED will be lit and compressor operation is inhibited. If a fault condition occurs, reverse two of the supply leads to the unit. Do not reverse any of the unit factory wires as damage may occur. SERVICE HINTS. Caution homeowner to maintain clean air filters at all times. Also, not to needlessly close off supply and return air registers. This reduces air flow through the system, which shortens equipment service life as well as increasing operating costs. 2. Switching to heating cycle at 75 F or higher outside temperature may cause a nuisance trip of the remote reset high pressure switch. Turn thermostat off, then on to reset the high pressure switch. 3. The heat pump wall thermostats perform multiple functions. Be sure that all function switches are correctly set for the desired operating mode before trying to diagnose any reported service problems. 4. Check all power fuses or circuit breakers to be sure they are the correct rating. 5. Periodic cleaning of the outdoor coil to permit full and unrestricted airflow circulation is essential. SEQUENCE OF OPERATION COOLING Circuit R-Y makes at thermostat pulling in compressor contactor, starting the compressor and outdoor motor. The G (indoor motor) circuit is automatically completed on any call for cooling operation or can be energized by manual fan switch on subbase for constant air circulation. HEATING A 24V solenoid coil on reversing valve controls heating cycle operation. Two thermostat options, one allowing "Auto" changeover from cycle to cycle and the other constantly energizing solenoid coil during heating season, and thus eliminating pressure equalization noise except during defrost, are to be used. On "Auto" option a circuit is completed from R-W and R-Y on each heating "on" cycle, energizing reversing valve solenoid and pulling in compressor contactor starting compressor and outdoor motor. R-G also make starting indoor blower motor. Heat pump heating cycle now in operation. The second option has no "Auto" changeover position, but instead energizes the reversing valve solenoid constantly whenever the system switch on subbase is placed in "Heat" position, the "B" terminal being constantly energized from R. A Thermostat demand for heat completes r-y circuit, pulling in compressor contactor starting compressor and outdoor motor. R-G also make starting indoor blower motor. PRESSURE SERVICE PORTS High and low pressure service ports are installed on all units so that the system operating pressures can be observed. Pressure tables can be found later in the manual covering all models on both cooling and heating cycles. It is imperative to match the correct pressure curve to the unit by model number. DEFROST CYCLE The defrost cycle is controlled by temperature and time on the solid state heat pump control. When the outdoor temperature is in the lower 40 F temperature range or colder, the outdoor coil temperature is 32 F or below. This coil temperature is sensed by the coil sensor mounted near the bottom of the outdoor coil. Once coil temperature reaches 30 F or below, the coil sends a signal to the control logic of the heat pump control and the defrost timer will start. After (90 or 30) minutes at 30 F or below, the heat pump control will place the system in the defrost mode. During the defrost mode, the refrigerant cycle switches back to the cooling cycle, the outdoor motor stops, electric heaters are energized, and hot gas passing through the outdoor coil melts any accumulated frost. When the temperature rises to approximately 57 F, the coil sensor will send a signal to the heat pump control which will return the system to heating operations automatically. If some abnormal or temporary conditions such as a high wind caused the heat pump to have a prolonged defrost cycle, the heat pump control will restore the system to heating operating automatically after minutes. There is a cycle SPEEDUP jumper on the control. This can be used to reduce the time between defrost cycle operation without waiting for time to elapse. Use a small screwdriver or other metallic object, or another /4 inch QC to short between the SPEEDUP terminals to accelerate the HPC timer and initiate defrost. Be careful not to touch any other terminals with the instrument used to short the SPEEDUP terminals. It may take up to seconds with the SPEEDUP terminals shorted for the speedup to be completed and the defrost cycle to start. Manual Page 5

18 As soon as the defrost cycle kicks in, remove the shorting instrument from the SPEEDUP terminals. Otherwise the timing will remain accelerated and run through the -minute maximum defrost length sequence in a matter of seconds and will automatically terminate the defrost sequence. There is an initial defrost (SEN JMP) jumper on the control that can be used at any outdoor ambient during the heating cycle to simulate a 0 coil temperature. This can be used to check defrost operation of the unit without waiting for the outdoor ambient to fall into the defrost region. The jumper connection (SEN JMP) on the heat Pump Control (HPC) that can be used during the heating cycle to simulate a 0 degree coil condition and initiate the defrost sequence. By placing a jumper across the SEN JMP terminals (/4 inch QC terminal works best) the defrost sensor mounted on the outdoor coil is shunted out and will activate the timing circuit. This permits the defrost cycle to be checked out in warmer weather conditions without the outdoor temperature having to fall into the defrost region. There are three time settings on the HPC 30, or on minutes. These are elapsed run-time values, and the outdoor coil temperature sensor must be below the 30 degree equivalent resistance value for the timer to accumulate time towards the actual defrost cycle event. Using the SEN JMP terminals will force the timer to run continuously. The next event is the actual defrost cycle when the reversing valve shifts the refrigerant system back to the cooling mode, and the outdoor fan motor is turned off to speed the heating of the outdoor coil and melting of any accumulated frost. The SPEEDUP terminals can be used to reduce the 30, or 90 minute real-time periods to a matter of seconds. Electric heat is typically turned on to temper the supply air temperature being delivered into the building during the defrost cycle. There is also a 5-minute compressor time delay function built into the HPC. This is to protect the compressor from short cycling conditions. In some instances it is helpful to the service technician to override or speedup this timing period, and shorting out the SPEEDUP terminals for a few seconds can do this. FIGURE DEFROST CONTROL BOARD Manual Page

19 TROUBLESHOOTING SOLID STATE HEAT PUMP CONTROL TROUBLESHOOTING PROCEDURE. Turn on AC power supply to indoor and outdoor units. 2. Turn thermostat blower switch to fan "on" the indoor blower should start. (If it doesn't, troubleshoot indoor unit and correct problem). 3. Turn thermostat blower switch to auto position. Indoor blower should stop. TABLE 5 TROUBLESHOOTING Symptom Compressor contactor does not energize (heating or cooling) Fan outdoor motor does not run (cooling or heating except during defrost) Reversing valve does not energize (heating only) Unit will defrost not go (heating only) into Unit will not come out of defrost (heating only) Possible Causes Control circuit wiring C ompressor lock out. Compressor short cycle protection Heat pump defective control Contactor defective Power phasing correct Motor defective Motor capacitor defective Heat pump defective not control Reversing valve solenoid coil defective Heat pump defective control Temperature sensor or heat pump control defective Temperature sensor or heat pump control defective What to Check Check for R connectio at uni t and 24 volt between R - C 2. Check for 24V between L-C on heat pump control Check across high presure switch. Check for 24 V between CC-C and Y-C on heat pump control. Check all other possible causes. Manual Check for winding. 4. Set system to heat or cool. Adjust thermostat to call for heat or cool the indoor blower, compressor, and outdoor fan should start. NOTE:If there was no power to 24 volt transformer, the compressor and outdoor fan motor will not start for 5 minutes. This is because of the compressor short cycle protection. open or shorted coil Check for red LED on phase monitor (3 phase units only). Check for open or motor winding. shorted Check capacitor ratng. Check for open or shorted capacitor. Check across fan relay on heat pump control (Com-NC). Run R connection to pump control.. 2. How to Check or Repair outdoor unit to power heat If no voltage between L-C, turn thermostat off and on again to reset high pressure switch. If high pressure switch is open and will not reset, replace high pressure switch. If not voltage between CC-C, jumper speed up terminal, and within seconds power should appear between CC-C. Remove speed up jumper after seconds. Replace heat pump Replace contactor. control. Switch two power leds to the unit. Replace motor. Replace capacitor. Replace heat pump C heck for open or shorted coil. Replace solenoid Coil. Check for 24V between RV-C and B-C. Disconnect temperature sensor from board and jumper across speed up terminals and sen jump terminals. This should caruse the unit to go through a defrost cycle within one minute. Jumper across speed up terminals. This should cause the unit to come out of defrost within one minute control. Check control circuit wiring. Replace heat pump control. If unit goes through defrost temperature sensor. cycle, replace If unit does not go through defrost cycle, replace heat pump control.. If unit comes out of defrost cycle replace temperature sensor. 2. If unit does not come out of defrost cycle, replace heat pump control. Manual Page 7

20 CHECKING TEMPERATURE SENSOR OUTSIDE UNIT CIRCUIT. Disconnect temperature sensor from board and from outdoor coil. 2. Use an ohmmeter and measure the resistance of the sensor. Also use ohmmeter to check for short or open. 3. Check resistance reading to chart of resistance. Use sensor ambient temperature. (Tolerance of part is ± %.) 4. If sensor resistance reads very low, then sensor is shorted and will not allow proper operation of the heat pump control. 5. If sensor is out of tolerance, shorted, open or reads very low ohms then it should be replaced. TEMPERATURE F VS. RESISTANCE R OF TEMPERATURE SENSOR F R F R F R F R Manual Page

21 FAN BLADE SETTING DIMENSIONS Shown in the drawing in Figure are the correct fan blade setting dimensions for proper air delivery across the outdoor coil. Any service work requiring removal or adjustment in the fan and/or motor area will require that the dimensions below be checked and blade adjusted in or out on the motor shaft accordingly. FIGURE FAN BLADE SETTING TABLE FAN BLADE DIMENSIONS Model WH42 WH43 WH2 Dimension A.75 MIS-90 REMOVAL OF FAN SHROUD. Disconnect all power to unit. 2. Remove the screws holding both grilles one on each side of unit and remove grilles. 3. Remove screws holding fan shroud to condenser and bottom (9) screws. 4. Unwire condenser fan motor. 5. Slide complete motor, fan blade, and shroud assembly out the left side of the unit.. Service motor/fan as needed. 7. Reverse steps to reinstall. REFRIGERANT CHARGE The correct system R-22 charge is shown on the unit rating plate. Optimum unit performance will occur with a refrigerant charge resulting in a suction line temperature ( inches from compressor) as shown in the Table 7. TABLE 7 SUCTION LINE TEMPERATURES Model WH42 WH43 WH2 Rated Airflow F O.D. Temperature F O.D. Temperature The suction line temperatures in Table 7 are based upon 0ºF dry bulb/7 degrees F wet bulb (50 percent R.H.) temperature and rated airflow across the evaporator during cooling cycle. TABLE RECOMMENDED OPERATING RANGES Model Rated C FM * Rated E SP * Recommended Air Flow Range WH WH WH * Rated CFM and ESP on high speed tap. E.S.P. In H O Dry Low Coil TABLE 9 INDOOR BLOWER PERFORMANCE 230V WH42, WH43 WH2 230V Wet Coil High Dry Coil V Wet Coil Low Dry Coil V Wet Coil High Dry Coil V Wet Coil Manual Page 9

22 Model Speed KW -A00 -A04 -A05 -A -A5 -A20 -B00 -B09 -B5 -B -C00 -C09 -C5 High TABLE MAIMUM ESP OF OPERATION ELECTRIC HEAT ONLY WH42 WH43 WH2 Speed Low Speed High Speed Low Speed High Speed Low Speed Values shown are for unites equipped with STD inch throwaway filter on inch washable filter. Derate ESP by.5 for 2 inch pleated filters. Model WH42 WH43 WH2 TABLE COOLING PRESSURE (ALL TEMPERATURES F) Return Air Temperature Pressure deg. DB 2 deg. WB 0 deg. DB 7 deg. WB 5 deg. DB 72 deg. WB 75 deg. DB 2 deg. WB 0 deg. DB 7 deg. WB 5 deg. DB 72 deg. WB 75 deg. DB 2 deg. WB 0 deg. DB 7 deg. WB Low Side High Side Low Side High Side Low Side High Side Low Side High Side Low Side High Side Low Side High Side Low Side High Side Low Side High Side 5 deg. DB Low Side 72 deg. WB High Side Low side pressure ± 2 psig High side pressure ± 5 psig Tables are based upon rated CFM (airflow) across the evaporator coil. If there is any doubt as to correct operating charge being in the system, the charge should be removed, system evacuated and recharged to serial plate instruction Manual Page 20

23 Model Return Air Temperature W H42 70 deg. W H43 70 deg. W H2 70 deg. TABLE 2 HEATING PRESSURES (ALL TEMPERATURES F) Pressure Low Side High Side Low Side High Side Low Side High Side Low side pressure ± 2 psig High side pressure ± 5 psig Tables are based upon rated CFM (airflow) across the evaporator coil. If there is any doubt as to correct operating charge being in the system, the charge should be removed, system evacuated and recharged to serial plate instruction TABLE 3 OPTIONAL ACCESSORIES Model Description WH42-A WH42-B WH42-C WH43-A WH43-B WH43-C WH2-A WH2-B WH2-C EHWH42-A05 EHWH42-A EHWH42-A5 EHWH42-C0 EHWH04-A04 EHWH04-A05 EHWH04-A EHWH04-A5 EHWH04-A20 EHWH04-B09 EHWH04-B5 EHWH04-B EHWH04-C09 EHWH04-C5 BOP-5 BFAD-5 MFAD-5 Blank Off Plate Barometric Fresh Air Damper Motorized Fresh Air Damper CRV-5 EIFM-4 WERV-A5B WERV-C5B Classroom Ventilator with Exhaust Economizer with Exhaust Energy Recovery Ventilator Energy Recovery Ventilator CMH-3 CMH-7 CMH-9 CMH-4 CMH-5 Low Pressure Control (LPC) Low Ambient Control (LAC) LAC + LPC Outdoor Thermostat (ODT) Start Kit (SK) WMCB-05B WMCB-0B WMPD-0 WMCB-07B WMCB-09A WMCB-0B Circuit Breaker Circuit Breaker Circuit Breaker Circuit Breaker Circuit Breaker Circuit Breaker Manual Page 2

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